<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var a= parseInt(prompt("请你输入第一个数字"));
        var b= parseInt(prompt("请你输入第二个数字"));
        document.write("两数之和为："+parseInt(a+b));
    </script>
</body>
</html>